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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c045ee091a28b4e5f2d1eb0e0449b5f7828b1a97e48c65a7abd2e09af9d6610b' 
  AND token = 'oJGJBkBIQ7EpcGDqJJbt91DurdAv7gj9QKeu6u/1+cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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