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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3295b332dd54bc653d699ed578c582d65ab51768ce6462784c1e2d42a0037e' 
  AND token = 'wi9sRALeH0vRurq24inJ2FeIoBKmAn2nwi4RnOQClps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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