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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367bcc7c2fbd01afcefd43576f9b863f4c09a7a94fe76b6a7ccede69da75454c' 
  AND token = 'LRBuGh2OSus51a357TylGPlv4lSu7lc7+C8FUYrwlbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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