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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf426bdb658a9ddbaead3994425c96ecc7c2fb9170ec137e6b07d3c2d630909d' 
  AND token = 'w4Gf8ERRKCtu8mOzbTrytA2Yff3T1v2d/vH+ziNKLmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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