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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4407a13aea9cd6600778cb12d6190cd3f1d51785df438ccf2d10173b4bcc869' 
  AND token = 't9Pp5djHHTlmel38BLoBiw4MCiMWYNvbyzfxFJS8Z50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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