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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cc1a8a0aa6a1f6d57c68cddb3ec37eb4268be713471712bb611ba48f7df51d3' 
  AND token = 'zdNWsZZ4sXP4F2MSuFR0N7Pt9LRO2L+LaQuVhYgw/g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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