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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd553021df50e36c4a66b2191ed561954eff8f7a3d2f5845985e410e0e66fc626' 
  AND token = '/gJ7hOpEks7hu1yo4d+3oHKNLk2ooP5LZCQlrVzLPTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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