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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39af69f92803a091698f73659703ee07aed9a74163200e85fd03f7275ce5648e' 
  AND token = 'FvJHPMMCT3Ic9J8lNkBKA9ciSX68SVRPu5RAGcJoVQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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