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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b95e2c2eb9dd0fa86fabef6405dfc2c0872aef4a5682d2d3b1b2fe21e95ce2f' 
  AND token = 'Z85YnAL376swR8JNnV66aeIH/sdWC8yXsKtYBUlEoJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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