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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78f2be510e0c414e3f7b0ab6f7cc78203c4e28800dd76311e5f322be7b8e3c69' 
  AND token = 'sMItYgN6lvK0qqHgOs8LHCN9tExJi52rycPgKeYYN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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