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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1666e8888d5929dc042a4065c5ee7d9fc9ed19bce6b2aeee5146e7a3ceabb4d7' 
  AND token = 'vu9sGT1x/HNb+29R+tdTJzjKKiU8/kjbe0TlYkyfoDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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