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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4fd564bcf94605c23bf366d9cee29cb62174802eb6b76cec709cf096a9db7ca' 
  AND token = 'mOBx5ReOh19vc/MudsSiseYQYfqgNld/+ylihHF1GXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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