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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4adbca8bb03e9448696191583478df8316fa02347a561d0b51d2adae039c993' 
  AND token = 'emxTe9cgOGN/odMItSbZC2/8QPcz5wWEfC4sZOR2OB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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