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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4fd15b5654f7c4caf55281f14a6f99150942bbfe6c372c53e3353a36ed18dde' 
  AND token = '0QdY4FCy2+0xhEx2Kx8SE8JL6jUukfF++R8ithNNJhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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