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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0c0b87e0958679111e8ca270f88bff0cdee3ef07040554a15af7cd9084f29e' 
  AND token = 'pRLMmuljX+OqCGsXgpvti3J+3y832BWrsIyxn5W9WdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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