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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27693a02ab3112c22e491185f1b2263677c28aebb6975c64430e285b2a8b37b0' 
  AND token = '87P27dv38NbHbFeOCeJKzIluXe1K+phMuhf8kPEE+w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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