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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d5666768cde039fd81c05008ef1ed9a185f50bb27b7e891617c694bdf534584' 
  AND token = 'iZhSyjuOQ3nlXgycstI6D/Gx1q5gK7pj5fLZfWqTW50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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