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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adedcb1bb874024b4907e174164c4a945ceef32e471c52878d188b00a86ed71a' 
  AND token = 'DrPLie/I6BGdLg6gJ/f0+eTaCuJ/vXNOyENM+4HAys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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