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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b97af9b259acd46ebb6267895e2b52087dddbb03e21b513405420a4dda6af2dc' 
  AND token = 'wNnYzQw8IXbgo9WIzK/XkYe6nSCYsYFTjuy2wRCl5Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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