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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48a1724d0a8a4073419890d171eba563680e94c5b66acc2a3b8c658c7f04466' 
  AND token = 'semv9TP4QhMjrc/IJ0fObHY5Cha1DhOYjZupfcl7Tb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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