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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '273d5810479ebef9f67476cd0867b53bacf1e7b2d2d84ca2cae0341de8e42d17' 
  AND token = 'lq+20zCtM9Jtikuf0aucLIaIMNf0Fhwu+9fgV901UNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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