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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f67aeadc6e8039c657f0b96d477e2fabd0a0f77301b9c4bfb65fe9dd7bf74ff5' 
  AND token = '0vJoHDt+Q/lLXvPLcT22KcyKbDR9tybhr1nG45oTT38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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