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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2404d552ce0178297e5d430e40c607086e90358ae3b5f407b79de82a010e0400' 
  AND token = 'I8QDs4ThNrvkehIJwdam8+rgcLOMIVqqnfhJ5STHaSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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