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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0178360ae9899d5f37622660d93abf23904d8c9aeff11cd9623ef3f365a0f5e3' 
  AND token = 'o2cN71AHA9ntOtzueJQb01usAE+Ry8bNdAByd4BKNMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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