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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a190ac928dce31ac6d4afe8d9c9accec8b3c73a9ca320a7caa659686c11c47c2' 
  AND token = 'hiEfyI5BWWsbowmh25eSeM46xKTmxRFGKyAM/leHnFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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