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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99408f9b64cc9b2049d8157432849bf1007ea1fcc9da1c970955dca6d97dfec8' 
  AND token = 'HHW+nTvHS0tKYhISWVstT/XNoEPBxrEBowvpfKLRfQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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