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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b4ece80f27c1e427844301faa8b464d6fef5e681c0cc56c0d2c6ab5e92995a' 
  AND token = 'oa/fvfOnSuDPcZ50BqaKdlTPtHxEn+I3slAUEErAKsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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