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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d1e0e14e29f335ee370bde139a3a1edba74eed9b7bc117eb6b5cb503d544021' 
  AND token = '3hbA3dTbckJHNxrwrxsNSrCzdv78Fn4tLK8hoovGysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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