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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4d1f0164ff37e14a8c07219e7ae05a467862c0cf13e600e925ea168c0f1d02' 
  AND token = 'X67no5cHyKhbWSfWV6eswoCaTwDOWk+k1/NNXienmik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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