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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1494e4cbd7c017449c3bcad3720ae6488417ea9b341720e9e01384b17045e92' 
  AND token = 'E65P2YC5ly/ErqlC+LLun2uTcdUxyEDFJYDzo6KD6MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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