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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddda02b5cd5437dfec737982b1de9df5f895cd44366832d6abc15944929f11c2' 
  AND token = '6duzdnkRkFiXuODPyLzbgangLpP3+HL0LFE/UF2wVyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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