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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe70fd8ad9c4e1465b5453dd676e7e2a387738083b747b4ac43b958e549d55b1' 
  AND token = 'Orgl751rE/ccflcO3tNb2bDodazAsOiuQpz76o1MKs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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