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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ca5391d74e28e0abc4b6bfb16fd0b9e8bcbe21b6c970c66bb561b4839afcc09' 
  AND token = 'W/TJB9hafyLMuenbXl2gjPpgVD9rW8KefRHLMmQ5bhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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