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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a08528349ab85a4b8d5aa8e85ed3e092820a651bf792e2382efe21913ac9977a' 
  AND token = '0Ue6xrnVdYRvVorM/TOOjaIiJh7KYCLreFGht/F7y1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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