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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71379b680d60df73ce0f8e2193146a0da170ec65c0beb762a78d63ff1c10a12a' 
  AND token = 'tRqQ++vtjI/+Q9YjTV4epSSVe8Uv7Z2sUloYdnMXtLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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