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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd86f6de83964eab0363b9da95922b0fa57383f8e1221d15b3cbd568c82512509' 
  AND token = 'W2QHvIm56YaUz7z4U8ckjHIQ/L03H4iqGCeyn9ImE0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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