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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c1c5a49d1e9c36b4eda4a2f45d2cd52bb26d5b898b33080aa56a3a0737fb84' 
  AND token = 'dM+XO33QfJLiD/OHx24ED1AefyAprGrVVdh1FbDVhCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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