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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '470a44ae7cb4569e35e540cd5bbcb733a8f06db60da8aac40e5dce1d47f37f56' 
  AND token = 'zD/m9TIQQ6IHMRhfoYkYeyNV6TnDOhGyqoBUUPQLPfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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