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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '192930c04da3f070db10952e29cc6735fb4a99ddca01dd73b4ed8f2df55d6946' 
  AND token = '/pMowrgBRdvpb0TtB2k9MI2kPEgCnwlPUMCHjciM47w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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