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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6532bfeed554529f70a45d43294425f4576e3ef2fb94300fd1b90b1c8ea7108b' 
  AND token = '6vt/kqqPNyU98BrV0JhukLD3aaG2iD/2I0hMxoY55AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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