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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02b4a498cfb752a479c815d0b5a1c9d064f1a6a3dc6409c1a0cdbbdbbe23c0bc' 
  AND token = 'PkbVOl9dD8+B9GZjKa9du4DFc0802p6qyMll4Bf3d58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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