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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bd679bb813645b0052c6da711641a6cd1010c9520e397103d599820fadef416' 
  AND token = 'AUmyLCIa9B2ZHfpSRZ3BoOtQv7Lvo4ATf+n9y2kWTqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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