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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ddd5eefb2ad29d638a28d4576aae3b0bf32bebefd3e902aa3ef1d763d53df2b' 
  AND token = 'lGb7t+CQvdMwducPFiQnUk9rLE9L4/r+Xd0yVjoqlp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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