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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f01c141fda89f5f17f4a27b4635dad08b902796001e0fdddced9a89ef8a2cfe' 
  AND token = 'k2r6SpPcLRokQE/1dNbk+HZO9VfT3ju5mHvaS5rK8Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}