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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e51b2cfebeda826fc51d50940800f30df1acf236cfa0007fc839a497f7ce967' 
  AND token = '7rNfrcGHl/ZABeBAhO1rCyVyPemQnMu1wwJ2GEUbvPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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