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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cce8cda97b9382d305a50c763e0ab1d99b4839c3d01f6d5cf74ebbb3841a1617' 
  AND token = 'SsGWYaIXZjkZX7mTm01uv0jpNhxC0/v7nWOp7T90p/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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